diff options
Diffstat (limited to 'drivers/input/mouse/navpoint.c')
-rw-r--r-- | drivers/input/mouse/navpoint.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/drivers/input/mouse/navpoint.c b/drivers/input/mouse/navpoint.c new file mode 100644 index 00000000000..c29ae7654d5 --- /dev/null +++ b/drivers/input/mouse/navpoint.c | |||
@@ -0,0 +1,369 @@ | |||
1 | /* | ||
2 | * Synaptics NavPoint (PXA27x SSP/SPI) driver. | ||
3 | * | ||
4 | * Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com> | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License version 2 as | ||
8 | * published by the Free Software Foundation. | ||
9 | */ | ||
10 | |||
11 | #include <linux/kernel.h> | ||
12 | #include <linux/init.h> | ||
13 | #include <linux/module.h> | ||
14 | #include <linux/platform_device.h> | ||
15 | #include <linux/clk.h> | ||
16 | #include <linux/delay.h> | ||
17 | #include <linux/gpio.h> | ||
18 | #include <linux/input.h> | ||
19 | #include <linux/input/navpoint.h> | ||
20 | #include <linux/interrupt.h> | ||
21 | #include <linux/mutex.h> | ||
22 | #include <linux/pxa2xx_ssp.h> | ||
23 | #include <linux/slab.h> | ||
24 | |||
25 | /* | ||
26 | * Synaptics Modular Embedded Protocol: Module Packet Format. | ||
27 | * Module header byte 2:0 = Length (# bytes that follow) | ||
28 | * Module header byte 4:3 = Control | ||
29 | * Module header byte 7:5 = Module Address | ||
30 | */ | ||
31 | #define HEADER_LENGTH(byte) ((byte) & 0x07) | ||
32 | #define HEADER_CONTROL(byte) (((byte) >> 3) & 0x03) | ||
33 | #define HEADER_ADDRESS(byte) ((byte) >> 5) | ||
34 | |||
35 | struct navpoint { | ||
36 | struct ssp_device *ssp; | ||
37 | struct input_dev *input; | ||
38 | struct device *dev; | ||
39 | int gpio; | ||
40 | int index; | ||
41 | u8 data[1 + HEADER_LENGTH(0xff)]; | ||
42 | }; | ||
43 | |||
44 | /* | ||
45 | * Initialization values for SSCR0_x, SSCR1_x, SSSR_x. | ||
46 | */ | ||
47 | static const u32 sscr0 = 0 | ||
48 | | SSCR0_TUM /* TIM = 1; No TUR interrupts */ | ||
49 | | SSCR0_RIM /* RIM = 1; No ROR interrupts */ | ||
50 | | SSCR0_SSE /* SSE = 1; SSP enabled */ | ||
51 | | SSCR0_Motorola /* FRF = 0; Motorola SPI */ | ||
52 | | SSCR0_DataSize(16) /* DSS = 15; Data size = 16-bit */ | ||
53 | ; | ||
54 | static const u32 sscr1 = 0 | ||
55 | | SSCR1_SCFR /* SCFR = 1; SSPSCLK only during transfers */ | ||
56 | | SSCR1_SCLKDIR /* SCLKDIR = 1; Slave mode */ | ||
57 | | SSCR1_SFRMDIR /* SFRMDIR = 1; Slave mode */ | ||
58 | | SSCR1_RWOT /* RWOT = 1; Receive without transmit mode */ | ||
59 | | SSCR1_RxTresh(1) /* RFT = 0; Receive FIFO threshold = 1 */ | ||
60 | | SSCR1_SPH /* SPH = 1; SSPSCLK inactive 0.5 + 1 cycles */ | ||
61 | | SSCR1_RIE /* RIE = 1; Receive FIFO interrupt enabled */ | ||
62 | ; | ||
63 | static const u32 sssr = 0 | ||
64 | | SSSR_BCE /* BCE = 1; Clear BCE */ | ||
65 | | SSSR_TUR /* TUR = 1; Clear TUR */ | ||
66 | | SSSR_EOC /* EOC = 1; Clear EOC */ | ||
67 | | SSSR_TINT /* TINT = 1; Clear TINT */ | ||
68 | | SSSR_PINT /* PINT = 1; Clear PINT */ | ||
69 | | SSSR_ROR /* ROR = 1; Clear ROR */ | ||
70 | ; | ||
71 | |||
72 | /* | ||
73 | * MEP Query $22: Touchpad Coordinate Range Query is not supported by | ||
74 | * the NavPoint module, so sampled values provide the default limits. | ||
75 | */ | ||
76 | #define NAVPOINT_X_MIN 1278 | ||
77 | #define NAVPOINT_X_MAX 5340 | ||
78 | #define NAVPOINT_Y_MIN 1572 | ||
79 | #define NAVPOINT_Y_MAX 4396 | ||
80 | #define NAVPOINT_PRESSURE_MIN 0 | ||
81 | #define NAVPOINT_PRESSURE_MAX 255 | ||
82 | |||
83 | static void navpoint_packet(struct navpoint *navpoint) | ||
84 | { | ||
85 | int finger; | ||
86 | int gesture; | ||
87 | int x, y, z; | ||
88 | |||
89 | switch (navpoint->data[0]) { | ||
90 | case 0xff: /* Garbage (packet?) between reset and Hello packet */ | ||
91 | case 0x00: /* Module 0, NULL packet */ | ||
92 | break; | ||
93 | |||
94 | case 0x0e: /* Module 0, Absolute packet */ | ||
95 | finger = (navpoint->data[1] & 0x01); | ||
96 | gesture = (navpoint->data[1] & 0x02); | ||
97 | x = ((navpoint->data[2] & 0x1f) << 8) | navpoint->data[3]; | ||
98 | y = ((navpoint->data[4] & 0x1f) << 8) | navpoint->data[5]; | ||
99 | z = navpoint->data[6]; | ||
100 | input_report_key(navpoint->input, BTN_TOUCH, finger); | ||
101 | input_report_abs(navpoint->input, ABS_X, x); | ||
102 | input_report_abs(navpoint->input, ABS_Y, y); | ||
103 | input_report_abs(navpoint->input, ABS_PRESSURE, z); | ||
104 | input_report_key(navpoint->input, BTN_TOOL_FINGER, finger); | ||
105 | input_report_key(navpoint->input, BTN_LEFT, gesture); | ||
106 | input_sync(navpoint->input); | ||
107 | break; | ||
108 | |||
109 | case 0x19: /* Module 0, Hello packet */ | ||
110 | if ((navpoint->data[1] & 0xf0) == 0x10) | ||
111 | break; | ||
112 | /* FALLTHROUGH */ | ||
113 | default: | ||
114 | dev_warn(navpoint->dev, | ||
115 | "spurious packet: data=0x%02x,0x%02x,...\n", | ||
116 | navpoint->data[0], navpoint->data[1]); | ||
117 | break; | ||
118 | } | ||
119 | } | ||
120 | |||
121 | static irqreturn_t navpoint_irq(int irq, void *dev_id) | ||
122 | { | ||
123 | struct navpoint *navpoint = dev_id; | ||
124 | struct ssp_device *ssp = navpoint->ssp; | ||
125 | irqreturn_t ret = IRQ_NONE; | ||
126 | u32 status; | ||
127 | |||
128 | status = pxa_ssp_read_reg(ssp, SSSR); | ||
129 | if (status & sssr) { | ||
130 | dev_warn(navpoint->dev, | ||
131 | "unexpected interrupt: status=0x%08x\n", status); | ||
132 | pxa_ssp_write_reg(ssp, SSSR, (status & sssr)); | ||
133 | ret = IRQ_HANDLED; | ||
134 | } | ||
135 | |||
136 | while (status & SSSR_RNE) { | ||
137 | u32 data; | ||
138 | |||
139 | data = pxa_ssp_read_reg(ssp, SSDR); | ||
140 | navpoint->data[navpoint->index + 0] = (data >> 8); | ||
141 | navpoint->data[navpoint->index + 1] = data; | ||
142 | navpoint->index += 2; | ||
143 | if (HEADER_LENGTH(navpoint->data[0]) < navpoint->index) { | ||
144 | navpoint_packet(navpoint); | ||
145 | navpoint->index = 0; | ||
146 | } | ||
147 | status = pxa_ssp_read_reg(ssp, SSSR); | ||
148 | ret = IRQ_HANDLED; | ||
149 | } | ||
150 | |||
151 | return ret; | ||
152 | } | ||
153 | |||
154 | static void navpoint_up(struct navpoint *navpoint) | ||
155 | { | ||
156 | struct ssp_device *ssp = navpoint->ssp; | ||
157 | int timeout; | ||
158 | |||
159 | clk_prepare_enable(ssp->clk); | ||
160 | |||
161 | pxa_ssp_write_reg(ssp, SSCR1, sscr1); | ||
162 | pxa_ssp_write_reg(ssp, SSSR, sssr); | ||
163 | pxa_ssp_write_reg(ssp, SSTO, 0); | ||
164 | pxa_ssp_write_reg(ssp, SSCR0, sscr0); /* SSCR0_SSE written last */ | ||
165 | |||
166 | /* Wait until SSP port is ready for slave clock operations */ | ||
167 | for (timeout = 100; timeout != 0; --timeout) { | ||
168 | if (!(pxa_ssp_read_reg(ssp, SSSR) & SSSR_CSS)) | ||
169 | break; | ||
170 | msleep(1); | ||
171 | } | ||
172 | |||
173 | if (timeout == 0) | ||
174 | dev_err(navpoint->dev, | ||
175 | "timeout waiting for SSSR[CSS] to clear\n"); | ||
176 | |||
177 | if (gpio_is_valid(navpoint->gpio)) | ||
178 | gpio_set_value(navpoint->gpio, 1); | ||
179 | } | ||
180 | |||
181 | static void navpoint_down(struct navpoint *navpoint) | ||
182 | { | ||
183 | struct ssp_device *ssp = navpoint->ssp; | ||
184 | |||
185 | if (gpio_is_valid(navpoint->gpio)) | ||
186 | gpio_set_value(navpoint->gpio, 0); | ||
187 | |||
188 | pxa_ssp_write_reg(ssp, SSCR0, 0); | ||
189 | |||
190 | clk_disable_unprepare(ssp->clk); | ||
191 | } | ||
192 | |||
193 | static int navpoint_open(struct input_dev *input) | ||
194 | { | ||
195 | struct navpoint *navpoint = input_get_drvdata(input); | ||
196 | |||
197 | navpoint_up(navpoint); | ||
198 | |||
199 | return 0; | ||
200 | } | ||
201 | |||
202 | static void navpoint_close(struct input_dev *input) | ||
203 | { | ||
204 | struct navpoint *navpoint = input_get_drvdata(input); | ||
205 | |||
206 | navpoint_down(navpoint); | ||
207 | } | ||
208 | |||
209 | static int __devinit navpoint_probe(struct platform_device *pdev) | ||
210 | { | ||
211 | const struct navpoint_platform_data *pdata = | ||
212 | dev_get_platdata(&pdev->dev); | ||
213 | struct ssp_device *ssp; | ||
214 | struct input_dev *input; | ||
215 | struct navpoint *navpoint; | ||
216 | int error; | ||
217 | |||
218 | if (!pdata) { | ||
219 | dev_err(&pdev->dev, "no platform data\n"); | ||
220 | return -EINVAL; | ||
221 | } | ||
222 | |||
223 | if (gpio_is_valid(pdata->gpio)) { | ||
224 | error = gpio_request_one(pdata->gpio, GPIOF_OUT_INIT_LOW, | ||
225 | "SYNAPTICS_ON"); | ||
226 | if (error) | ||
227 | return error; | ||
228 | } | ||
229 | |||
230 | ssp = pxa_ssp_request(pdata->port, pdev->name); | ||
231 | if (!ssp) { | ||
232 | error = -ENODEV; | ||
233 | goto err_free_gpio; | ||
234 | } | ||
235 | |||
236 | /* HaRET does not disable devices before jumping into Linux */ | ||
237 | if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) { | ||
238 | pxa_ssp_write_reg(ssp, SSCR0, 0); | ||
239 | dev_warn(&pdev->dev, "ssp%d already enabled\n", pdata->port); | ||
240 | } | ||
241 | |||
242 | navpoint = kzalloc(sizeof(*navpoint), GFP_KERNEL); | ||
243 | input = input_allocate_device(); | ||
244 | if (!navpoint || !input) { | ||
245 | error = -ENOMEM; | ||
246 | goto err_free_mem; | ||
247 | } | ||
248 | |||
249 | navpoint->ssp = ssp; | ||
250 | navpoint->input = input; | ||
251 | navpoint->dev = &pdev->dev; | ||
252 | navpoint->gpio = pdata->gpio; | ||
253 | |||
254 | input->name = pdev->name; | ||
255 | input->dev.parent = &pdev->dev; | ||
256 | |||
257 | __set_bit(EV_KEY, input->evbit); | ||
258 | __set_bit(EV_ABS, input->evbit); | ||
259 | __set_bit(BTN_LEFT, input->keybit); | ||
260 | __set_bit(BTN_TOUCH, input->keybit); | ||
261 | __set_bit(BTN_TOOL_FINGER, input->keybit); | ||
262 | |||
263 | input_set_abs_params(input, ABS_X, | ||
264 | NAVPOINT_X_MIN, NAVPOINT_X_MAX, 0, 0); | ||
265 | input_set_abs_params(input, ABS_Y, | ||
266 | NAVPOINT_Y_MIN, NAVPOINT_Y_MAX, 0, 0); | ||
267 | input_set_abs_params(input, ABS_PRESSURE, | ||
268 | NAVPOINT_PRESSURE_MIN, NAVPOINT_PRESSURE_MAX, | ||
269 | 0, 0); | ||
270 | |||
271 | input->open = navpoint_open; | ||
272 | input->close = navpoint_close; | ||
273 | |||
274 | input_set_drvdata(input, navpoint); | ||
275 | |||
276 | error = request_irq(ssp->irq, navpoint_irq, 0, pdev->name, navpoint); | ||
277 | if (error) | ||
278 | goto err_free_mem; | ||
279 | |||
280 | error = input_register_device(input); | ||
281 | if (error) | ||
282 | goto err_free_irq; | ||
283 | |||
284 | platform_set_drvdata(pdev, navpoint); | ||
285 | dev_dbg(&pdev->dev, "ssp%d, irq %d\n", pdata->port, ssp->irq); | ||
286 | |||
287 | return 0; | ||
288 | |||
289 | err_free_irq: | ||
290 | free_irq(ssp->irq, &pdev->dev); | ||
291 | err_free_mem: | ||
292 | input_free_device(input); | ||
293 | kfree(navpoint); | ||
294 | pxa_ssp_free(ssp); | ||
295 | err_free_gpio: | ||
296 | if (gpio_is_valid(pdata->gpio)) | ||
297 | gpio_free(pdata->gpio); | ||
298 | |||
299 | return error; | ||
300 | } | ||
301 | |||
302 | static int __devexit navpoint_remove(struct platform_device *pdev) | ||
303 | { | ||
304 | const struct navpoint_platform_data *pdata = | ||
305 | dev_get_platdata(&pdev->dev); | ||
306 | struct navpoint *navpoint = platform_get_drvdata(pdev); | ||
307 | struct ssp_device *ssp = navpoint->ssp; | ||
308 | |||
309 | free_irq(ssp->irq, navpoint); | ||
310 | |||
311 | input_unregister_device(navpoint->input); | ||
312 | kfree(navpoint); | ||
313 | |||
314 | pxa_ssp_free(ssp); | ||
315 | |||
316 | if (gpio_is_valid(pdata->gpio)) | ||
317 | gpio_free(pdata->gpio); | ||
318 | |||
319 | return 0; | ||
320 | } | ||
321 | |||
322 | #ifdef CONFIG_PM_SLEEP | ||
323 | static int navpoint_suspend(struct device *dev) | ||
324 | { | ||
325 | struct platform_device *pdev = to_platform_device(dev); | ||
326 | struct navpoint *navpoint = platform_get_drvdata(pdev); | ||
327 | struct input_dev *input = navpoint->input; | ||
328 | |||
329 | mutex_lock(&input->mutex); | ||
330 | if (input->users) | ||
331 | navpoint_down(navpoint); | ||
332 | mutex_unlock(&input->mutex); | ||
333 | |||
334 | return 0; | ||
335 | } | ||
336 | |||
337 | static int navpoint_resume(struct device *dev) | ||
338 | { | ||
339 | struct platform_device *pdev = to_platform_device(dev); | ||
340 | struct navpoint *navpoint = platform_get_drvdata(pdev); | ||
341 | struct input_dev *input = navpoint->input; | ||
342 | |||
343 | mutex_lock(&input->mutex); | ||
344 | if (input->users) | ||
345 | navpoint_up(navpoint); | ||
346 | mutex_unlock(&input->mutex); | ||
347 | |||
348 | return 0; | ||
349 | } | ||
350 | #endif | ||
351 | |||
352 | static SIMPLE_DEV_PM_OPS(navpoint_pm_ops, navpoint_suspend, navpoint_resume); | ||
353 | |||
354 | static struct platform_driver navpoint_driver = { | ||
355 | .probe = navpoint_probe, | ||
356 | .remove = __devexit_p(navpoint_remove), | ||
357 | .driver = { | ||
358 | .name = "navpoint", | ||
359 | .owner = THIS_MODULE, | ||
360 | .pm = &navpoint_pm_ops, | ||
361 | }, | ||
362 | }; | ||
363 | |||
364 | module_platform_driver(navpoint_driver); | ||
365 | |||
366 | MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>"); | ||
367 | MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver"); | ||
368 | MODULE_LICENSE("GPL"); | ||
369 | MODULE_ALIAS("platform:navpoint"); | ||